Market capitalization is calculated by multiplying the current share price by the total number of shares outstanding, representing the equity market's real-time assessment of a company's total value. Companies are commonly categorized as large-cap (typically above $10 billion), mid-cap ($2–$10 billion), and small-cap (below $2 billion), though precise thresholds vary by data provider. These size categories carry different risk and return characteristics: large-caps tend to be more stable and liquid but have lower growth ceilings, while small-caps carry more volatility but can grow faster from a smaller base. Market cap is distinct from enterprise value, which also accounts for debt and cash, making it a less complete measure of total company value. Watching how market cap changes relative to revenue or earnings can reveal whether a stock is expanding or contracting its valuation multiple.
